EP1940602B1 - Dispositif de refroidissement d'insert de moule - Google Patents

Dispositif de refroidissement d'insert de moule Download PDF

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Publication number
EP1940602B1
EP1940602B1 EP06790679A EP06790679A EP1940602B1 EP 1940602 B1 EP1940602 B1 EP 1940602B1 EP 06790679 A EP06790679 A EP 06790679A EP 06790679 A EP06790679 A EP 06790679A EP 1940602 B1 EP1940602 B1 EP 1940602B1
Authority
EP
European Patent Office
Prior art keywords
insert
mold cavity
mold
jacket
cavity insert
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP06790679A
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German (de)
English (en)
Other versions
EP1940602A1 (fr
EP1940602A4 (fr
Inventor
Guoming Li
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Husky Injection Molding Systems SA
Original Assignee
Husky Injection Molding Systems SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Husky Injection Molding Systems SA filed Critical Husky Injection Molding Systems SA
Publication of EP1940602A1 publication Critical patent/EP1940602A1/fr
Publication of EP1940602A4 publication Critical patent/EP1940602A4/fr
Application granted granted Critical
Publication of EP1940602B1 publication Critical patent/EP1940602B1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/72—Heating or cooling
    • B29C45/73—Heating or cooling of the mould
    • B29C45/7312—Construction of heating or cooling fluid flow channels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/081—Specified dimensions, e.g. values or ranges
    • B29C2949/082—Diameter
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/25—Solid
    • B29K2105/253—Preform

Definitions

  • the present invention relates generally to injection molding and particularly relates to an apparatus for cooling an article in a mold.
  • Injection molding is a commonly employed manufacturing technique for forming articles.
  • An example of an article that is typically formed using injection molding is a plastic preform.
  • a plastic preform can then be subsequently blow-molded into a plastic bottle.
  • An injection mold for making preforms (and other articles) typically includes one or more molding cavities for receiving molten plastic and forming the preforms.
  • the cavities are usually defined between complementary cylindrically-shaped mold cavity inserts.
  • the injection mold also includes a mold shoe, typically comprising a set of plates, within which the mold cavity inserts are arranged.
  • the injection mold also includes a hot runner for communicating a flow of the molten plastic into the molding cavities.
  • the molten plastic injected into the cavities must be cooled to solidify the molten plastic so that the molded preform can be removed from the mold. It is desirable to cool the preform as quickly as possible so the preforms can be removed and a next injection cycle initiated with minimal time delay.
  • cooling of the mold cavity inserts was typically achieved by creating a cooling channel in an exterior surface of the mold cavity insert. Typically, such a channel is a spiral, but it can be any shape that directs a flow of coolant about the exterior of the mold cavity insert.
  • the mold cavity insert needs to withstand enormous pressures as the molten plastic is injected.
  • the cooling channel is integrally formed on the mold cavity insert, the stresses along the length of the mold cavity insert are non-uniform. Indeed, stress gradients at various points along the path of the channel of the mold cavity inserts can be observed. The stress is often the greatest where the cooling channel makes abrupt changes in direction.
  • the wall thickness of the mold cavity insert is increased to provide sufficient structural strength to withstand injection pressures.
  • the wall thickness of the mold cavity inserts are at least about 6.4 millimeters.
  • a minimum permissible wall thickness of the mold cavity insert limits the maximum size of the preform or other article that can be formed therein.
  • Figure 1 is a front view of a known injection mold cavity plate 60.
  • the plate 60 includes a matrix of openings or bores 32 for receiving a plurality of mold stack assemblies (not depicted).
  • the matrix 60 is depicted as having four rows and eight columns.
  • the size of the matrix 60 is determined by many factors such as the size of a molding machine (not depicted), the maximum size of the mold and the size of the articles to be made.
  • the matrix 60 in the present example would accommodate a total of thirty-two mold stack assemblies.
  • FIG. 2 is a partial sectional view of a known injection mold 1 in use with the cavity plate 60 of Figure 1 .
  • the mold 1 is depicted with a known molding stack assembly 53.
  • the stack assembly 53 includes a mold cavity insert 54 with an outside diameter D, a. gate insert 55, a neck ring pair 52 (which comprises two neck rings 5), a core insert 57, and a locking ring 58 that are configured to cooperate to provide a molding cavity 59 along a set of molding surfaces disposed thereon. Molding cavity 59 thus provides a chamber within which a preform 4 can be formed. (Other configurations of cavity 59 would thus permit the formation of other articles other than preform 4).
  • the mold shoe includes a cavity plate 60, a core plate 61, a stripper plate 62, and a slide pair 63.
  • the core insert 57 is arranged on a front surface of the core plate 61 and retained thereon by the lock ring 58.
  • the core plate 61 includes core coolant channels 76, 77 and 78 for connecting with a coolant channel configured within the core insert 57.
  • Core coolant channels 76, 77 and 78 further interconnect with core cooling tube 80.
  • the entire inside of the molding cavity 59 extends along the molding surface of core insert 57.
  • Coolant channels 70 and 17 provide coolant to one half of slide pair 63 and neck ring pair 52.
  • the mold cavity insert 54 is arranged within a bore in cavity plate 60.
  • the gate insert 55 is arranged within a bore configured in a top portion of the mold cavity insert 54. As can be seen, a substantial portion of the outside of the molding cavity 59 extends along the interior surfaces of mold cavity insert 54 and a smaller portion along gate insert 55.
  • Cavity plate 60 also includes coolant channels 75 for connecting with a coolant channel 90 that is configured around the periphery of mold cavity insert 54 to form a cooling circuit.
  • the cooling channel 90 is defined on one side by the bore within cavity plate 60 and on the other side by a plurality of dividers 94 integrally formed in the wall of the mold cavity inert 54.
  • FIG 3 is a perspective view of another known embodiment mold cavity insert 54 and gate insert 55 for use with the injection mold 1 of Figure 2 .
  • the coolant channel 90 is substantially spiral, but is also characterized by two longitudinal channels 96. Each longitudinal channel 96 represents a substantial change in direction of the coolant flow in relation to the remainder of channel 90.
  • the wall thickness T of the mold cavity insert 54 is clearly dictated to prevent mechanical failure of the mold cavity insert 54 in the areas of highest stress concentrations.
  • the wall thickness T is typically the distance between the molding surface of the mold cavity 59 and the bottom of the cooling groove 90 in mold cavity insert 54.
  • the minimum wall thickness T for the mold cavity insert 54 is at least about 6.4 millimeters.
  • the mold is limited to forming parts that have an outside diameter that is limited by the wall thickness of the insert. If the thickness of the insert and its associated coolant channel can be reduced then parts having a larger diameter could be molded without having to modify the cavity plate.
  • US patent 3,784,344 discloses parts of a blow-mold having cooling spaces for circulation of a coolant, and that have a negative inner wall corresponding to the outer contours of the hollow body to be formed.
  • Each blow-mold part includes a box-type metal body frame and a thin-walled insert presenting the negative contour, each insert being secured to the associated body frame and closing it off internally so that each insert and its associated body frame defines a respective cooling chamber of substantially the height of the insert.
  • the inserts may be relatively thin sheet metal in which the contours are formed by cold working or cold shaping.
  • the blow-mold has centering apertures, at each end, for a shoulder insert and a bottom insert both of which have recesses seating the sheet metal shell inserts.
  • the cooling chamber is divided, for coolant circulation, by guide plates which are shorter than the height of the chamber and terminate alternately in engagement with the shoulder insert and with the bottom insert so that a zig-zag flow path is provided.
  • US patent 5,498,150 discloses a mold assembly that includes a mold part with a plurality of elongated cavities therein forming the outer wall of a molded part and wherein a fluid cooled core is inserted within each of the elongated cavities having an outer surface forming the inner wall of the molded part and the fluid cooled core includes an inner surface having a plurality of circumferentially spaced, longitudinally directed ribs for reinforcing the fluid cooled core radially inwardly of the elongated cavities and along the length of said' fluid cooled core to control core deflection.
  • a fluid inlet pipe is located axially of the inner surface in spaced relationship thereto having one end thereof adapted to be connected to a source of coolant and including a second end thereon in communication with a plurality of circumferentially spaced passages formed between each of the longitudinally directed ribs and wherein each of the passages returns flow to an elongated annular passage between the fluid inlet pipe and the inner surface.
  • a novel apparatus in a first aspect of the present invention, there is provided a novel apparatus according to claim 1.
  • the apparatus includes a jacket receivable within a bore of a cavity plate and a cylindrical mold cavity insert having a substantially uniform wall thickness, the cylindrical mold cavity insert coaxially receivable within the jacket such that the jacket, the bore and the insert collectively defining a channel for carrying a coolant along a periphery of the insert.
  • a molding system that comprises F the apparatus of claim 1.
  • a technical effect of the aspects of the present invention is that the jacket allows for a reduction in a thickness of the mold cavity insert' and/or a reduction in a thickness of the coolant channel, such that articles having a larger diameter may be molded by the mold without having to modify the cavity plate.
  • Figure 4 is the partial sectional view of an injection mold 101 that shows a stack assembly 153 that includes a mold cavity insert 154 according to the first embodiment.
  • the components in Figure 4 that are similar to components in Figure 2 bear the same reference for sake of simplifying the description of the embodiment. However, there are notable exceptions to the components depicted in Figure 4 , as described below.
  • Figure 5 is the sectional view of the mold cavity insert 154 of Figure 4 .
  • the mold cavity insert 154 is a cylinder having a wall 198 of substantially uniform wall thickness T1. Since wall thickness T1 is substantially uniform, insert 154 does not experience the same unequal stresses that exist in the prior art insert 54 of Figure 2 .
  • FIG 6 is the first perspective view of the mold cavity insert 154 of Figure 4 .
  • the assembly 132 includes a jacket 140 that coaxially surrounds insert 154.
  • Jacket 140 coaxially surrounds insert 154 to provide a coolant channel 190 along a periphery of insert 154.
  • Coolant channel 190 is, itself, defined by the bore within cavity plate 60 and wall 198 in cooperation with jacket 140.
  • FIG 7 is the second perspective view of the mold cavity insert 154, disassembled, of Figure 4 .
  • the jacket 140 is substantially a helical coil.
  • Jacket 140 can be made of any suitable material such as metal and plastics.
  • jacket 140 is affixed to insert 154 with a hex bolt 104, however, jacket 140 can be cooperatively associated with insert 154 in any variety of manners that will now occur to those of skill in the art.
  • jacket 140 When fully assembled according to Figure 4 , jacket 140 preferably has an inside diameter slightly greater than the external diameter of wall 198, and jacket 140 has an outside diameter slightly smaller than the internal diameter of the bore with cavity plate 60, such that jacket 140 has an overall thickness T2 (Reference FIG. 5 ). Thickness T2 thus also defines the depth of cooling channel 190.
  • Thickness T2 thus also defines the depth of cooling channel 190.
  • the technical effect of the present invention may also be achieved from an interference fit between the foregoing diameters.
  • the cavity molding surface will have an outside diameter of A that typically varies along its length.
  • the insert 154 is a solid cylinder, with an inherently homogenous stress distribution, it can be thinner than the insert 54 and withstand the same injection pressures as the prior art insert 54.
  • the wall thickness T1 of the insert 154 can be less than the thickness T of the prior art cavity insert 54.
  • the maximum preform diameter A for a given standard mold arrangement with an unchanged bore in the cavity plate, may be greater than the diameter of the preform formed in the prior art stack.
  • parts having a larger diameter can be molded in the stack mold assembly 153 than can be molded in the stack mold assembly 53 without modifying the cavity plate in the mold.
  • the wall thickness of the cavity insert 54 wall was at least 6.4 mm and permitted a preform of a maximum diameter of 28.2 mm to be formed.
  • Replacing the cavity insert 54 with the insert 154 and jacket 140 enabled preforms of up to 32.2 mm to be formed.
  • the wall thickness of the cavity insert T1 can be 4.4 mm.
  • wall thickness T1 can be less than thickness T, and yet insert 154 will still be able to withstand substantially the same injection pressures as insert 54.
  • the wall thickness T1 of the insert 154 can, in some circumstances, be as low as 3.5 mm thick. In any event, with the present invention it is possible to increase the size of the preform by reducing the thickness of the cavity insert to a thickness within the range of 3.5 to 6.4 mm.
  • Figure 8 is the first perspective view of the mold cavity insert 254 according to the second embodiment.
  • Figure 9 is the second perspective view of the mold cavity insert 254, disassembled, according to the second embodiment.
  • a mold insert assembly in accordance with another embodiment of the invention is indicated generally at 232 and includes gate insert 55, cavity insert 254 and jacket 240.
  • Assembly 232 is analogous to assembly 132, and thus like components in assembly 232 to like components in assembly 132 bear the same reference, except identified by an increase of 100 in the number.
  • jacket 240 is not helical but includes a coolant channel 290 having a different pathway than coolant channel 190.
  • jacket 240 includes a central pillar 220, from which a plurality of non-continuous loops 224 depend transversely from alternating sides of pillar 220.
  • Jacket 240 is retained on the outer periphery of insert 254 between a pair of annular rims 228 that project outwardly away from wall 298.
  • a coolant channel such as channel 190 or 290
  • a jacket can be configured to provide any desired configuration of coolant channel that will provide the necessary and/or otherwise desired level of cooling to the insert, depending on the other factors associated with the design of the mold insert assembly. (e.g. temperature of coolant; flow rate of coolant; temperature of the injection mold material; cycle times etc.)

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)
  • Coupling Device And Connection With Printed Circuit (AREA)

Claims (9)

  1. Dispositif destiné à être utilisé dans un moule d'injection (101) ayant une plaque de cavité (60), le dispositif comprenant :
    une chemise (140; 240) configurée pour être reçue, en utilisation, dans un alésage (32) de la plaque de cavité (60) ; et
    un insert de cavité de moule cylindrique (154; 254) ayant une épaisseur de paroi uniforme (T1), dans lequel, en utilisation, l'insert de cavité de moule cylindrique (154; 254) est reçu coaxialement dans la chemise (140; 240) de telle manière que la chemise (140; 240), l'alésage (32) et l'insert de cavité de moule cylindrique (154; 254) définissent collectivement un canal dans l'alésage (32) de la plaque de cavité (60) pour transporter un réfrigérant le long de la surface extérieure de l'insert de cavité de moule cylindrique (154; 254) et de telle manière qu'une surface de moulage de l'insert de cavité de moule cylindrique (154; 254) définit une partie d'une cavité de moulage (59) du moule d'injection (101).
  2. Dispositif selon la revendication 1, dans lequel la chemise (140) est une bobine hélicoïdale qui entoure l'insert de cavité de moule cylindrique (154).
  3. Dispositif selon la revendication 2, dans lequel la bobine hélicoïdale est fixée sur l'insert de cavité de moule cylindrique (154).
  4. Dispositif selon la revendication 3, dans lequel l'insert de cavité de moule cylindrique (254) inclut une paire de records (228) et, en utilisation, la chemise (240) est fixée sur l'insert de cavité de moule cylindrique (254) en étant retenue entre la paire de rebords (228).
  5. Dispositif selon la revendication 1, dans lequel l'épaisseur de paroi (T1) est entre 3,5 et 6,4 mm.
  6. Dispositif selon la revendication 5, dans lequel l'épaisseur de paroi (T1) est d'environ 4,4 mm.
  7. Dispositif selon la revendication 1, dans lequel la chemise (240) inclut un pilier central (220) supportant une pluralité de boudes non continues (224) s'étendant transversalement depuis des côtés alternés du pilier central (220).
  8. Dispositif selon la revendication 1, dans lequel l'insert de cavité de moule cylindrique (154; 254) est configuré pour coopérer, en utilisation, avec un insert d'entrée (55) et une paire de bagues de goulot (52) du moule injection (101).
  9. Moule d'injection (101), comprenant :
    une plaque de cavité (60) ayant une pluralité d'alésages (32) ; et
    le dispositif selon l'une quelconque des revendications 1 à 8, dans lequel le dispositif est reçu dans au moins un alésage (32) de la plaque de cavité (60).
EP06790679A 2005-10-20 2006-09-13 Dispositif de refroidissement d'insert de moule Active EP1940602B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US11/254,325 US7361009B2 (en) 2005-10-20 2005-10-20 Mold cavity insert for use in an injection mold
PCT/CA2006/001506 WO2007045074A1 (fr) 2005-10-20 2006-09-13 Dispositif de refroidissement d'insert de moule

Publications (3)

Publication Number Publication Date
EP1940602A1 EP1940602A1 (fr) 2008-07-09
EP1940602A4 EP1940602A4 (fr) 2008-12-03
EP1940602B1 true EP1940602B1 (fr) 2009-08-05

Family

ID=37962148

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06790679A Active EP1940602B1 (fr) 2005-10-20 2006-09-13 Dispositif de refroidissement d'insert de moule

Country Status (8)

Country Link
US (1) US7361009B2 (fr)
EP (1) EP1940602B1 (fr)
CN (1) CN101291791B (fr)
AT (1) ATE438499T1 (fr)
CA (1) CA2624321C (fr)
DE (1) DE602006008334D1 (fr)
TW (1) TWI306431B (fr)
WO (1) WO2007045074A1 (fr)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006028174A1 (de) * 2006-06-16 2007-12-20 Mht Mold & Hotrunner Technology Ag Formnestkavität mit mäanderförmigem Kühlkanal
DE102006028149A1 (de) * 2006-06-16 2007-12-20 Mht Mold & Hotrunner Technology Ag Formnestkavität mit entkoppelter Kühlkanalführung
US7566216B2 (en) * 2007-04-29 2009-07-28 Husky Injection Molding Systems Ltd. Mold assembly using inserts
US7568906B2 (en) * 2007-04-30 2009-08-04 Husky Injection Molding Systems Ltd. Mold assembly using inserts
US7575429B2 (en) * 2007-07-20 2009-08-18 Husky Injection Molding Systems Ltd. Compensating mold stack for use in a molding system
US7645132B2 (en) 2007-09-07 2010-01-12 Husky Injection Molding Systems Ltd. Mold insert and mold stack for use with molding machine
WO2010069042A1 (fr) * 2008-12-18 2010-06-24 Husky Injection Molding Systems Ltd. Préforme, pile de moules pour la fabrication du préforme et procédé d'orientation du préforme pendant le moulage soufflage
USD730416S1 (en) * 2010-11-12 2015-05-26 Husky Injection Molding Systems Ltd. Lock ring for use in a mold stack
CA2862340A1 (fr) * 2011-02-21 2012-09-07 Grail Inventions (Pty) Ltd Ensemble moule
US9004906B2 (en) 2011-02-28 2015-04-14 Mold-Masters (2007) Limited Cavity insert film flow cooling
US8585392B2 (en) 2011-05-24 2013-11-19 F&S Tool, Inc. Compression molding with successive stage cooling channels
WO2013049882A1 (fr) * 2011-10-03 2013-04-11 Modi Consulting And Investments Pty Ltd Outil de refroidissement conforme présentant une performance de cycle thermique rapide
DE102013100277B4 (de) * 2013-01-11 2018-06-21 Peter Budde Formkern, Formeinsatz und Formwerkzeug zum Herstellen von Formteilen
CA3120659A1 (fr) * 2018-12-11 2020-06-18 Husky Injection Molding Systems Ltd. Moules, ensembles moules et elements d'empilement
EP3894161A4 (fr) 2018-12-11 2022-09-07 Husky Injection Molding Systems Luxembourg IP Development S.à.r.l Moules, ensembles moules et composants d'empilage
USD958209S1 (en) * 2019-06-04 2022-07-19 Husky Injection Molding Systems Ltd. Molding machine part

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GB1362252A (en) * 1970-07-23 1974-07-30 Korsch E Korsch Korsch Spezial Maschinen emil split blow mould for the production of hollow articles of thermo- plastic synthetic materials
US5443381A (en) 1994-07-18 1995-08-22 Gellert; Jobst U. Injection molding one-piece insert having cooling chamber with radial rib portions
US5498150A (en) 1995-01-09 1996-03-12 Check; John M. High thermal capacity mold assembly
IT1289373B1 (it) * 1996-04-18 1998-10-02 Sipa Spa Procedimento e impianto perfezionato per la produzione di preforme in resina termoplastica
JPH10128839A (ja) 1996-11-01 1998-05-19 Aokiko Kenkyusho:Kk プリフォーム成形時の首部下側の温調方法及びコア型
CN1231341C (zh) 1997-04-16 2005-12-14 哈斯基注模系统有限公司 非晶体塑料制品的局部结晶方法和装置
CA2255798C (fr) 1998-12-07 2008-06-17 Jobst Ulrich Gellert Noyau de refroidissement d'equipement de moulage par injection a rainures helicoidales
DE19903699A1 (de) * 1999-01-30 2000-08-03 Kurt Reinhardt Formwerkzeug
CA2262176C (fr) 1999-02-17 2008-04-22 Jobst Ulrich Gellert Element rapporte refroidi d'appareil de moulage par injection
US6443216B1 (en) 2000-06-01 2002-09-03 Aemp Corporation Thermal jacket for a vessel
US7222834B2 (en) * 2001-08-14 2007-05-29 Floodcooling Technologies, Llc Tool and a method for making a tool
US6737007B2 (en) 2002-09-19 2004-05-18 Husky Injection Molding Systems, Ltd Cooling tube with porous insert

Also Published As

Publication number Publication date
DE602006008334D1 (de) 2009-09-17
ATE438499T1 (de) 2009-08-15
CA2624321A1 (fr) 2007-04-26
US7361009B2 (en) 2008-04-22
CN101291791A (zh) 2008-10-22
US20070092596A1 (en) 2007-04-26
WO2007045074A1 (fr) 2007-04-26
CN101291791B (zh) 2012-03-21
EP1940602A1 (fr) 2008-07-09
TW200730333A (en) 2007-08-16
EP1940602A4 (fr) 2008-12-03
CA2624321C (fr) 2011-01-25
TWI306431B (en) 2009-02-21

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